WO2017194189A1 - Élément de sécurité et support de données - Google Patents

Élément de sécurité et support de données Download PDF

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Publication number
WO2017194189A1
WO2017194189A1 PCT/EP2017/000572 EP2017000572W WO2017194189A1 WO 2017194189 A1 WO2017194189 A1 WO 2017194189A1 EP 2017000572 W EP2017000572 W EP 2017000572W WO 2017194189 A1 WO2017194189 A1 WO 2017194189A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
security element
optically variable
element according
color
Prior art date
Application number
PCT/EP2017/000572
Other languages
German (de)
English (en)
Inventor
Winfried HOFFMÜLLER
Björn Teufel
Manfred Heim
Original Assignee
Giesecke+Devrient Currency Technology Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke+Devrient Currency Technology Gmbh filed Critical Giesecke+Devrient Currency Technology Gmbh
Publication of WO2017194189A1 publication Critical patent/WO2017194189A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/346—Perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials

Definitions

  • the invention relates to a security element and to a data carrier equipped with the security element, e.g. a document of value, such as a banknote or identity card.
  • a data carrier equipped with the security element e.g. a document of value, such as a banknote or identity card.
  • Security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
  • security elements can be embodied, for example, in the form of a security thread embedded in a banknote, a covering film for a banknote with a hole, an applied security strip, a self-supporting transfer element or else in the form of a feature area applied directly to a value document.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression under different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • WO 2009/109291 A1 describes a security element in which a thin-layer element with a color shift effect and a relief structure present in an embossing lacquer layer are arranged, the embossing lacquer layer having the relief structure being metallized in partial areas and the relief structure of the partially metallized embossing lacquer layer being leveled with a transparent lacquer layer whose refractive index substantially corresponds to the refractive index of the embossing lacquer layer.
  • the relief structure of the embossing lacquer layer may represent a diffractive structure, such as a hologram, a holographic grating image or a hologram-like diffraction structure, or an achromatic structure, such as a matt structure with a non-colored, silvery matt appearance, a micromirror arrangement, a blaze grating with a sawtooth groove profile or a Fresnellinsen- arrangement.
  • the dimensions of the structural elements of the diff erative relief structures are usually in the order of magnitude of the wavelength of light, that is usually between 300 nm and 1 ⁇ .
  • Some relief structures also have smaller structural elements, such as sub-wavelength gratings or moth-eye structures, whose structural elements may also be smaller than 100 nm.
  • the structural elements achromatic micro relief structures are partially larger than 1 ⁇ , the dimensions of micromirrors or Blazegitterlinien extend approximately to a height of about 15 ⁇ and a lateral extent of about 30 ⁇ .
  • the thin-film element has a reflection layer, an absorber layer and a dielectric spacer layer arranged between the reflection layer and the absorber layer. The color shift effect in such thin-film elements is based on viewing angle-dependent interference effects due to multiple reflections in the different sub-layers of the element.
  • the path difference between the light reflected at the different layers depends on On the other hand, from the optical thickness of the dielectric spacer layer, which determines the distance between the absorber layer and the reflective layer, and on the other hand varies with the respective viewing angle. Since the path difference is on the order of the wavelength of the visible light, the result is an angle-dependent color impression for the viewer due to the extinction and amplification of certain wavelengths.
  • a multiplicity of different color-shift effects can be designed, for example tilting effects in which the color impression changes with the viewing angle from green to blue, from blue to magenta or from magenta to green.
  • the object of the invention is to provide an improved security element of the type mentioned above with high security against counterfeiting and an attractive visual appearance.
  • Security element for securing documents of value comprising a carrier substrate and an optically variable layer, which gives different color impressions from different viewing angles, wherein the optically variable layer is provided in a certain area with a semi-transparent ink layer and the absorption spectrum of the semitransparent color layer is such that it clearly overlaps with the reflection spectrum of the optically variable layer at least at a first viewing angle.
  • the first viewing angle is in particular (i) the vertical or nearly vertical right viewing of the security element, or (ii) the acute viewing of the security element.
  • the absorption spectrum of the semitransparent color layer is such that it clearly overlaps with the reflection spectrum of the optically variable layer at least at a first viewing angle and with the reflection spectrum of the optically variable layer at a second viewing angle in the Essentially does not overlap.
  • the first viewing angle is the vertical or nearly vertical viewing of the security element and the second viewing angle is the acute angle viewing of the security element, or
  • the first viewing angle is the acute viewing of the security element and the second viewing angle is the vertical or nearly vertical viewing. consideration of the security element.
  • the reflection band of the optically variable layer is preferably within the visible spectral range.
  • the same color impression mediates and (ii) at the first viewing angle in certain area on the one hand, in which the optically variable layer provided with the semi-transparent ink layer
  • a different color impression is imparted. 5.
  • a security element according to any one of paragraphs 1 to 4, wherein (i) the first viewing angle represents the perpendicular viewing of the security element and the second viewing angle represents the acute angle viewing of the security element, or (ii) the first viewing angle is the acute viewing of the security element Represents security element and the second viewing angle represents the vertical view of the security element.
  • Primer layer is contained in an embossing lacquer layer or in a heat sealing lacquer layer or the semitransparent ink layer forms a protective lacquer, a primer layer, an embossing lacquer layer or a heat sealing lacquer layer.
  • the embossing lacquer layer has first areas with a low layer thickness and second areas with a high layer thickness, and preferably the first areas on the one hand and the second areas on the other convey different color impressions at the first viewing angle.
  • the security element according to paragraph 12, wherein the thin-film element has a reflection layer, an absorber layer and a dielectric spacer layer arranged between the reflection layer and the absorber layer.
  • the carrier substrate is transparent.
  • a security element according to any one of paragraphs 1 to 14, wherein the semitransparent ink layer (i) is arranged above the optically variable layer on the side of the security element remote from the carrier substrate, or (ii) between the carrier substrate and the op - or (iii) is arranged above the carrier substrate on the side of the security element remote from the optically variable layer.
  • Data carrier according to paragraph 17, wherein the data carrier is a value document, such as a banknote, in particular a paper banknote, polymer banknote or composite film banknote, or identity card.
  • the data carrier referred to in the present description can be a value document such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a coupon, a check, a high-quality admission ticket, but It may also be an identification card, such as a credit card, a bank card, a cash card, an authorization card, an identity card, or a pass personalization page.
  • a banknote in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a coupon, a check, a high-quality admission ticket
  • an identification card such as a credit card, a bank card, a cash card, an authorization card, an identity card, or a pass personalization page.
  • the security element according to the invention can be present, for example, as a patch or label, as a (continuous) strip or as an (endless) thread.
  • the data carrier substrate of the data carrier to be equipped with the security element according to the invention is in particular a paper substrate or a paper-like substrate, a polymer substrate, a paper / film / paper composite substrate or a film / paper / film composite substrate.
  • a value document or security paper provided with a window region can be produced, for example, by means of a through-cut within the paper layer (s).
  • the paper layer can be made transparent by means of a suitable liquid, for example by means of aqueous sulfuric acid solution, within a certain range.
  • a window region can be produced, for example, by means of congruent recesses in the opaque printed layers applied to the front and back of the polymer substrate.
  • optically variable layer structures known from the prior art, for example with a reflector-dielectric-absorber structure, exhibit a spectrum which is physically conditioned by the layer structure. Normally, a higher-order spectrum is used. If an interference spectrum at a defined wavelength is required, for reasons of production technology and for reasons of brilliance, the layer thickness of the dielectric is usually chosen such that the shortest wavelength pronounced reflection maximum is not optically effective.
  • Gold to green is associated with great difficulties, because a broad reflection maximum at about 667 nm is used for this optical impression, whereby the edge regions of the reflection band interfere with the color impression in the case of slight deviations and the dielectric layers, eg SiO 2 layers, very much must be applied evenly.
  • the use of the higher-order reflection maxima has the advantage of narrower reflection bands, on the other hand, the bands are so close to each other that several bands inevitably play a role in the overall color impression and, therefore, certain color impressions are not achieved.
  • the security element according to the invention is characterized in that on the side facing the viewer, a semitransparent or translucent color layer (which is also referred to herein simply as "color layer") is present, the absorption spectrum of which differs significantly with the reflection spectrum of the optical element
  • the semitransparent or translucent ink layer may, in particular, be designed as a motif over part of the area and / or as a motif.
  • optically variable layer for example, a color-shifting layer structure or a thin-film element with a color-shift effect
  • different optical effects are possible:
  • Variant V A reflection band of the optically variable layer can be masked out by the color layer when viewed perpendicularly or almost perpendicularly.
  • a PVD-available color-shifting layer structure magenta-green, overcoated with "Ciba® ORASOL® Yellow 4GN” produces a color-shifting structure red-green.
  • Variant 2 A reflection band can be hidden by the color layer when viewed at an acute angle. For example, a PVD-available color-shifting layer structure green-blue, coated with "Ciba® ORASOL® Yellow 4GN", produces a color-shifting structure green-black.
  • the optically effective reflection band which lies at almost vertical viewing at 512 nm, when tilted in the absorption range of the dye, thereby "extinguished.”
  • the further reflection band when viewed vertically at 1038nm is so long-wavy that they do not tilting becomes optically effective.
  • Variant 3 A color-shifting layer structure obtainable by means of PVD Green magenta, overcoated with "Ciba® ORASOL® Orange G", results in a color-shifting structure green-red.
  • the reflection band at 511 nm is noticeably weakened by the absorption maximum at about 480 nm. Due to the high sensitivity of the human eye in the green area, the color impression of the layer structure remains green. When tilting, the reflection maximum moves into the short-wave range. This light is completely absorbed by the color layer, especially as the optical path through the dye layer becomes longer during tilting. When tilting, therefore, the color red appears, starting from the lying at a vertical viewing at 760 nm band, because the otherwise existing blue component of the short-wave band is hidden.
  • Variant 4 Although there is a color-shifting effect with regard to certain color-shifting layer structures obtainable by means of PVD, the color-shift effect is difficult to achieve in view of additional disturbing reflection bands and / or a large width of the used band with edge regions critical for the color impression. For example, in the case of an available by PVD fbilting layer structure gold-green.
  • Blue light can be absorbed by a yellow color layer, eg "ORASOL Yellow 4GN.”
  • a yellow color layer eg "ORASOL Yellow 4GN.
  • "migrating" bands from the long-wave range can be blocked by a low concentration of a blue dye, eg "ORASOL Blue GL”.
  • the color layer is expediently arranged somewhere on the optical path between the optically variable layer and the viewer.
  • the color layer can first be applied above a (film) substrate, followed by an absorber layer (eg Cr), a dielectric layer (eg SiO 2) 2 ), possibly a wash ink layer (ie, a soluble in a suitable solvent and thus washable layer so that areas with recesses, so-called "Cleartext” or "negative writing” available), and a reflector layer or reflective layer (eg AI).
  • an absorber layer eg Cr
  • a dielectric layer eg SiO 2
  • wash ink layer ie, a soluble in a suitable solvent and thus washable layer so that areas with recesses, so-called “Cleartext” or “negative writing” available
  • a reflector layer or reflective layer eg AI
  • the color layer need not be immediately adjacent to the optically variable layer, eg, a thin-film element with a color-shift effect, but may be spaced apart by one or more intervening layers, such as a foil.
  • the color layer can form a protective lacquer or be contained in a protective lacquer which is intended for the protection of the optically variable layer, for example a thin-film element with a color-shift effect.
  • the color layer can furthermore be contained in a primer layer, in a UV varnish or in a heat sealing varnish or form a primer layer, a UV varnish or a heat seal varnish.
  • the color layer may in particular be contained in an embossing lacquer layer (eg a UV lacquer) or form an emboss lacquer layer (eg a UV lacquer).
  • the security element according to the invention has the following layer structure:
  • a carrier substrate e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a lacquer layer such as a UV lacquer
  • a lacquer layer such as a UV lacquer, which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer, at least at one viewing angle;
  • a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent lacquer layer;
  • the lacquer layer is in particular an embossing lacquer layer and has a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement;
  • optically variable layer which is particularly adapted to the relief structure of the preceding lacquer layer; the optically variable layer may have a multilayer structure, eg an absorber layer (eg Cr), followed by a dielectric layer (eg S1O2) followed by a reflector layer (eg Al).
  • the above semitransparent lacquer layer which in particular has a relief structure, is formed according to a preferred variant in a first region with a high layer thickness and in a second region with a low layer thickness. In this way, different color impressions can be generated at a certain viewing angle.
  • the security element according to the invention has the following layer structure:
  • a carrier substrate e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a lacquer layer such as a UV lacquer
  • an embossing lacquer such as a UV lacquer, e.g. a relief structure forming a diffractive structure and / or a micro-mirror arrangement forming relief structure;
  • the preceding embossing lacquer is provided in partial regions with a semi-transparent ink layer (for example a color layer which can be obtained by printing), the absorption spectrum of which clearly overlaps the reflection spectrum of the optically variable layer, at least at one viewing angle;
  • a reflection band of the optically variable layer which lies within the visible spectral range is masked out by the semitransparent color layer at least at a viewing angle;
  • the semi-transparent ink layer is formed in particular in the form of characters or a pattern or a coding or has recesses in the form of characters, a pattern or an encoding;
  • the security element has the following layer structure:
  • a carrier substrate e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a e.g. commercially available color layer which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer at least at one viewing angle;
  • a reflection band of the optically variable layer which lies within the visible spectral range is masked out by the semitransparent color layer at least at a viewing angle;
  • the color layer can be present over the whole area or only in certain areas, in particular in the form of characters, a pattern or an encoding;
  • a lacquer layer such as a UV lacquer
  • a further lacquer layer such as a UV lacquer
  • an optically variable layer eg in the form of a multilayer structure such as the following structure: absorber layer (eg Cr), followed by a dielectric layer (eg Si0 2 ) followed by a reflector layer (eg Al);
  • an adhesive layer e.g. a heat sealing lacquer suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • the carrier substrate can be designed as a removable carrier substrate. That in the case of bonding the security element to a value document substrate, the carrier substrate may optionally be peeled off the value document substrate provided with the security element.
  • the security element according to the invention has the following layer structure:
  • a carrier substrate eg a film, such as a polyethylene terephthalate (PET) film
  • a lacquer layer such as a UV lacquer, which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer, at least at one viewing angle;
  • a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent lacquer layer;
  • the semitransparent lacquer layer can be present over the entire area or only in certain areas, in particular in the form of characters, a pattern or a coding;
  • a lacquer layer such as a UV lacquer
  • an optically variable layer e.g. in the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., SrCh) followed by a reflector layer (e.g., Al);
  • absorber layer e.g., Cr
  • dielectric layer e.g., SrCh
  • reflector layer e.g., Al
  • an adhesive layer e.g. a heat sealing lacquer suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • the carrier substrate can be designed as a removable carrier substrate. That in the case of bonding the security element to a value document substrate, the carrier substrate may optionally be peeled off the value document substrate provided with the security element.
  • the security element according to the invention has the following layer structure:
  • a carrier substrate e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a lacquer layer such as a UV lacquer
  • a lacquer layer such as a UV lacquer, which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer, at least at one viewing angle;
  • a reflection band of the optically variable layer the is within the visible spectral range, hidden at least at a viewing angle through the semitransparent lacquer layer;
  • the lacquer layer may be present over the entire area or only in certain areas, in particular in the form of characters, a pattern or a coding;
  • an optically variable layer e.g. in the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., S1O2) followed by a reflector layer (e.g., Al);
  • absorber layer e.g., Cr
  • dielectric layer e.g., S1O2
  • reflector layer e.g., Al
  • an adhesive layer e.g. a heat sealing lacquer suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • the carrier substrate can be designed as a removable carrier substrate. That in the case of bonding the security element to a value document substrate, the carrier substrate may optionally be detached from the value document substrate equipped with the security element.
  • the security element according to the invention has the following layer structure:
  • a paint receiving layer e.g. a printable, based on S1O2 or A 03 particles layer
  • a primer layer which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer at least at one viewing angle; in particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent primer layer; the primer layer can be present over the whole area or only in certain regions, in particular in the form of characters, a pattern or a coding;
  • a carrier substrate e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a lacquer layer such as a UV lacquer
  • a further lacquer layer such as a UV lacquer
  • an optically variable layer e.g. in the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., S1O2) followed by a reflector layer (e.g., Al); optionally an adhesive layer, e.g. a heat sealing lacquer suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • absorber layer e.g., Cr
  • a dielectric layer e.g., S1O2
  • a reflector layer e.g., Al
  • an adhesive layer e.g. a heat sealing lacquer suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • the security element according to the invention has the following layer structure:
  • a color accepting layer e.g., a printable layer containing S1O2 or AkC particles
  • a color accepting layer that is semi-transparent and that clearly overlaps its absorption spectrum with the reflection spectrum of the optically variable layer at least at one viewing angle; in particular, a reflection band of the optically variable layer, which lies within the visible spectral range, is masked out, at least at a viewing angle, by the semitransparent ink acceptance layer;
  • the ink-accepting layer may be present over the whole area or only in certain areas, in particular in the form of characters, a pattern or a coding;
  • a carrier substrate e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a lacquer layer such as a UV lacquer
  • a further lacquer layer such as a UV lacquer
  • an optically variable layer e.g. in the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a
  • Dielectric layer e.g., S1O2
  • a reflector layer e.g., Al
  • an adhesive layer eg, a heat sealing lacquer, suitable for bonding to a value document substrate (eg, a banknote substrate).
  • the security element according to the invention has the following layer structure: a paint receiving layer, for example a printable layer based on SiO 2 or Al 2 O 3 particles;
  • a carrier substrate e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • the semitransparent color layer whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer at least at one viewing angle;
  • a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent color acceptance layer;
  • the semitransparent ink layer may be present over the entire area or only in certain areas, in particular in the form of characters, a pattern or an encoding;
  • a lacquer layer such as a UV lacquer
  • a further lacquer layer such as a UV lacquer
  • an optically variable layer e.g. in the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., S1O2) followed by a reflector layer (e.g., Al);
  • absorber layer e.g., Cr
  • dielectric layer e.g., S1O2
  • reflector layer e.g., Al
  • an adhesive layer e.g. a heat sealing lacquer suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • FIG. 1 shows the reflection spectrum of a color-tilting layer structure "magenta-green” obtainable by means of PVD;
  • Figure 2 shows the transmission spectrum of a green-yellow layer based on the substance "Ciba® ORASOL® Yellow 4GN”;
  • Figure 3 is a film in plan view when viewed vertically
  • Foil in the upper area has a color-tilting layer structure "magenta-green" obtainable by means of PVD and has a red-green layer-tipping layer structure in the lower area which is printed by a color-tilting layer
  • FIG. 4 shows a film in plan view with an acute-angle view, wherein the film has a color-tilting layer structure "magenta-green” obtainable by means of PVD and has a red-green layer-tipping layer structure in the lower region, which is printed by printing on a color-tilting layer structure "magenta -Green "with a green-yellow layer based on the substance" Ciba® ORASOL® Yellow 4GN "was obtained;
  • FIG. 5 shows a security element according to the invention according to a first
  • FIG. 6 shows a security element according to the invention in accordance with a second exemplary embodiment
  • FIG. 7 shows a security element according to the invention in accordance with a third exemplary embodiment
  • FIG. 8 shows a security element according to the invention in accordance with a fourth exemplary embodiment
  • FIG. 9 shows a security element according to the invention in accordance with a fifth exemplary embodiment
  • FIG. 10 shows a security element according to the invention in accordance with a sixth exemplary embodiment
  • Figure 11 shows a security element according to the invention according to a seventh embodiment
  • FIG. 12 shows a security element according to the invention according to an eighth embodiment
  • the color-shifting layer structure "magenta-green” is magenta-colored when viewed perpendicularly or almost perpendicularly and shows the color green when viewed at an acute angle.
  • FIG. 2 shows the transmission spectrum of a green-yellow layer obtained by printing technology on the basis of the substance "Ciba® ORASOL® Yellow 4GN.”
  • the percentage of the transmitted or transmitted light (vertical axis) is related to the wavelength of the light
  • the reference number 2 indicates the absorption band of the dye at about 430 nm.
  • FIG. 3 shows a film 3 in a top view in the case of vertical (or almost vertical) viewing, the film 3 having a color-tilting layer structure "magenta-green” available in the upper region 4 and a color-shifting layer structure "red-green” in the lower region 5.
  • the absorption band of the dye at approximately 430 nm suppresses the reflection band of the color-shifting layer structure at 424 nm. This leaves the reflection band at 633 nm, which is now responsible for the color shift effect.
  • the short-wave band migrates when tilted in the UV range and remains optically ineffective.
  • the film 3 appears in vertical (or nearly vertical) viewing in the upper region 4 magenta-colored and reddish in the lower region 5.
  • FIG. 4 shows the film 3 in plan view with an acute-angle view.
  • the film 3 appears in its entire area in green color.
  • FIG. 5 shows a security element 6 according to the invention in accordance with a first exemplary embodiment.
  • the security element 6 has the following layer structure:
  • a carrier substrate 7 e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a UV varnish 9 which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer 10 at least at one viewing angle;
  • a reflection band of the optically variable layer 10 which is within the visible spectral range, hidden at least at a viewing angle through the semitransparent UV coating 9;
  • the UV varnish 9 is an embossing lacquer layer and has a micro-mirror arrangement forming relief structure;
  • an optically variable layer 10 which is adapted to the relief structure of the preceding lacquer layer 9;
  • the optically variable layer 10 has a multilayered structure, namely an absorber layer 11 (Cr), followed by a dielectric layer 12 (S1O2), followed by a reflector layer 13 (AI).
  • the above semitransparent varnish layer 9 having a relief structure is formed in the high-thickness regions indicated by the letter “A” and formed in the low-thickness region indicated by the letter “B". In this way, different color impressions can be generated at a certain viewing angle.
  • FIG. 6 shows a security element 14 according to the invention in accordance with a second exemplary embodiment.
  • the security element 14 has the following layer structure:
  • a carrier substrate e.g. a polyethylene terephthalate (PET) film
  • PET polyethylene terephthalate
  • an embossing lacquer 17 e.g. a UV varnish having a diffractive structure forming relief structure and / or a micromirror arrangement forming relief structure;
  • the preceding embossing lacquer 17 is provided in partial regions with a semitransparent ink layer 18 (eg a color layer obtainable by printing) whose absorption spectrum clearly overlaps the reflection spectrum of the optically variable layer (19, 20, 21) at least at one viewing angle; in particular, a reflection band of the optically variable layer (19, 20, 21) lying within the visible spectral range is masked out by the semitransparent color layer 18 at least at a viewing angle; the semitransparent color layer 18 is formed in particular in the form of characters or a pattern or a coding or has recesses in the form of characters, a pattern or an encoding;
  • a semitransparent ink layer 18 eg a color layer obtainable by printing
  • an optically variable layer is formed, which in the areas outside the semi-transparent color layer 18 is adapted to the relief structure of the embossing lacquer 17;
  • the optically variable layer has a multilayer structure, namely an absorber layer 19 (e.g., Cr), followed by a dielectric layer 20 (e.g., S1O2) followed by a reflector layer 21 (e.g., Al).
  • FIG. 7 shows a security element 22 according to the invention in accordance with a third exemplary embodiment.
  • the security element 22 has the following layer structure:
  • a carrier substrate 23 e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a printable color layer 24 which is semitransparent and whose absorption spectrum is clearly overlapped with the reflection spectrum of the optically variable layer 27, at least at one viewing angle; in particular, a reflection band of the optically variable layer 27 lying within the visible spectral range is masked out by the semitransparent color layer 24 at least at a viewing angle; the color layer 24 can be present over the entire surface or only in regions, in particular in the form of characters, a pattern or a coding;
  • a lacquer layer 25 such as a UV lacquer
  • a further lacquer layer 26 such as a UV lacquer
  • an optically variable layer 27 in the example in the form of a multilayer structure, having the following structure: absorber layer 28 (Cr), followed by a dielectric layer 29 (S1O2), followed by a reflector layer 30 (AI); optionally an adhesive layer (not shown in FIG. 7), for example a heat-sealing lacquer suitable for bonding to a value document substrate (eg a banknote substrate).
  • the carrier substrate 23 may optionally be configured as a removable carrier substrate. That is, in the case of bonding the security element 22 to a value document substrate, the carrier substrate 23 may be detached from the value document substrate provided with the security element 22, if necessary.
  • FIG. 8 shows a security element 31 according to the invention in accordance with a fourth exemplary embodiment.
  • the security element 31 has the following layer structure:
  • a carrier substrate 32 e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a UV varnish 33 which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer 35 at least at one viewing angle;
  • a reflection band of the optically variable layer 35 which lies within the visible spectral range, is masked out, at least at a viewing angle, by the semitransparent UV lacquer 33;
  • the semitransparent UV varnish 33 can be present over the entire surface or only in regions, in particular in the form of characters, a pattern or a coding;
  • an optically variable layer 35 e.g. in the form of a multi-layered structure having the following structure: absorber layer 36 (Cr), followed by a dielectric layer 37 (S1O2), followed by a reflector layer 38 (AI);
  • the carrier substrate 32 may optionally be configured as a removable carrier substrate. That is, in the case of bonding the security element 31 to a value document substrate, the carrier substrate 32 may optionally be detached from the value document substrate equipped with the security element 31.
  • FIG. 9 shows a security element 39 according to the invention in accordance with a fifth exemplary embodiment.
  • the security element 39 has the following layer structure:
  • a carrier substrate 40 e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a UV varnish 42 which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer 43 at least at one viewing angle; in particular, a reflection band of the optically variable layer 43, which lies within the visible spectral range, is masked out, at least at a viewing angle, by the semitransparent UV varnish; the semitransparent UV varnish can be present over the whole area or only in certain areas, in particular in the form of characters, a pattern or an encoding;
  • an optically variable layer 43 for example in the form of a multilayer structure, having the following structure: absorber layer 44 (Cr), followed by a dielectric layer 45 (Si0 2 ), followed by a reflector layer 46 (AI);
  • an adhesive layer e.g. a heat seal varnish suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • the carrier substrate 40 may optionally be configured as a removable carrier substrate. That is, in the case of bonding the security element 39 to a value document substrate, the support substrate 39 may optionally be are detached from the value document substrate equipped with the security element 39.
  • FIG. 10 shows a fiction, security element 47 according to a sixth embodiment.
  • the security element 47 has the following layer structure:
  • a paint accepting layer 48 eg a printable, based on S1O2 or Al 2 03 particles layer;
  • a primer layer 49 which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer 53 at least at one viewing angle; in particular, a reflection band of the optically variable layer 53 which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent primer layer 49; the primer layer 49 can be present over the entire surface or only in regions, in particular in the form of characters, a pattern or an encoding;
  • a carrier substrate 50 e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a lacquer layer 51 such as a UV lacquer
  • a further lacquer layer 52 such as a UV lacquer
  • an optically variable layer 53 e.g. in the form of a multilayered structure having the following structure: absorber layer 54 (Cr), followed by a dielectric layer 55 (S1O2), followed by a reflector layer 56 (e.g., Al);
  • an adhesive layer e.g. a heat sealing lacquer suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • FIG 11 shows a security element according to the invention 57 according to a seventh embodiment.
  • the security element 57 has the following layer structure: a color accepting layer 58 (eg a printable layer containing S1O2 or Al203 particles) which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer 63 at least at one viewing angle; in particular, a reflection band of the optically variable layer 63 which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent ink accepting layer 58; the ink-accepting layer 58 can be present over the whole area or only in certain regions, in particular in the form of characters, a pattern or a coding;
  • a color accepting layer 58 eg a printable layer containing S1O2 or Al203 particles
  • a carrier substrate 60 e.g. a film such as a polyethylene terephthalate (PET) film;
  • PET polyethylene terephthalate
  • a lacquer layer 61 such as a UV lacquer
  • a further lacquer layer 62 such as a UV lacquer
  • an optically variable layer 63 e.g. in the form of a multilayered structure having the following structure: absorber layer 64 (Cr), followed by a dielectric layer 65 (S1O2), followed by a reflector layer 66 (AI);
  • an adhesive layer e.g. a heat seal varnish suitable for bonding to a value document substrate (e.g., a banknote substrate).
  • FIG. 12 shows a security element 67 according to the invention according to an eighth exemplary embodiment.
  • the security element 67 has the following layer structure:
  • a paint accepting layer 68 eg a printable film based on S1O2 or Al20 3 particles;
  • a carrier substrate 70 for example a film such as a polyethylene terephthalate (PET) film
  • a semitransparent ink layer 71 which can be obtained by printing technology, whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer 74, at least at one viewing angle; in particular, a reflection band of the optically variable layer 74 that lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent ink accepting layer 71; the semitransparent ink layer 71 may be present over the entire surface or only in regions, in particular in the form of characters, a pattern or an encoding;
  • PET polyethylene terephthalate
  • a lacquer layer 72 such as a UV lacquer
  • a further lacquer layer 73 such as a UV lacquer
  • an optically variable layer 74 e.g. in the form of a multi-layered structure such as the following structure: absorber layer 75 (e.g., Cr) followed by a dielectric layer 76 (e.g., S1O2) followed by a reflector layer 77 (e.g., Al);
  • absorber layer 75 e.g., Cr
  • dielectric layer 76 e.g., S1O2
  • reflector layer 77 e.g., Al
  • an adhesive layer e.g. a heat sealing lacquer suitable for bonding to a value document substrate (e.g., a banknote substrate).

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Abstract

L'invention concerne un élément de sécurité (6) destiné à protéger des documents de valeur, lequel élément comprend un substrat support (7) et une couche optiquement variable (10) dont les couleurs varient selon l'angle d'observation, une partie définie de cette couche optiquement variable (10) étant pourvue d'une couche colorée semi-transparente (9) dont le spectre d'absorption est tel qu'il se superpose nettement au spectre de réflexion de la couche optiquement variable sous un premier angle d'observation.
PCT/EP2017/000572 2016-05-12 2017-05-11 Élément de sécurité et support de données WO2017194189A1 (fr)

Applications Claiming Priority (2)

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DE102016005893.5 2016-05-12
DE102016005893.5A DE102016005893A1 (de) 2016-05-12 2016-05-12 Sicherheitselement und Datenträger

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WO2017194189A1 true WO2017194189A1 (fr) 2017-11-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018008549A1 (de) 2018-10-31 2020-04-30 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement und mit dem Sicherheitselement ausgestatteter Datenträger
US11788231B2 (en) 2019-06-24 2023-10-17 International Paper Company Paper substrates incorporating covert marking pigments, and processes for obtaining and using same

Citations (5)

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DE102004049118A1 (de) * 2004-10-07 2006-04-13 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
EP1669213A1 (fr) * 2004-12-09 2006-06-14 Sicpa Holding S.A. Elément de sécurité avec un aspect dépendent de l'angle d'observation
EP1719636A1 (fr) * 2005-05-04 2006-11-08 Sicpa Holding S.A. Élement de sécurité qui change du noir à une autre couleur selon l'angle d'observation
WO2007138255A1 (fr) * 2006-05-26 2007-12-06 De La Rue International Limited Améliorations concernant la fabrication de dispositifs de sécurité
EP2420391A2 (fr) * 2010-07-19 2012-02-22 Hueck Folien Ges.m.b.H. Elément de sécurité doté d'une couche optiquement variable

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Publication number Priority date Publication date Assignee Title
DE102008013167A1 (de) 2008-03-07 2009-09-10 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049118A1 (de) * 2004-10-07 2006-04-13 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
EP1669213A1 (fr) * 2004-12-09 2006-06-14 Sicpa Holding S.A. Elément de sécurité avec un aspect dépendent de l'angle d'observation
EP1719636A1 (fr) * 2005-05-04 2006-11-08 Sicpa Holding S.A. Élement de sécurité qui change du noir à une autre couleur selon l'angle d'observation
WO2007138255A1 (fr) * 2006-05-26 2007-12-06 De La Rue International Limited Améliorations concernant la fabrication de dispositifs de sécurité
EP2420391A2 (fr) * 2010-07-19 2012-02-22 Hueck Folien Ges.m.b.H. Elément de sécurité doté d'une couche optiquement variable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018008549A1 (de) 2018-10-31 2020-04-30 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement und mit dem Sicherheitselement ausgestatteter Datenträger
WO2020088791A1 (fr) 2018-10-31 2020-05-07 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité et support de données équipé de l'élément de sécurité
US11788231B2 (en) 2019-06-24 2023-10-17 International Paper Company Paper substrates incorporating covert marking pigments, and processes for obtaining and using same

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